Gray is stone floors.
Tan is floor space occupied with torture equipment. Squares are considered hindering (2 squares of movement) and provide partial cover.
Light blue is web. Squares are considered hindering (2 squares of movement), requires a successful CMB roll or become grappled to move through and provide partial cover.
Squares marked with an S are affected by a Silence spell.
Blue rectangle is stone altar. It is blocking terrain and provided cover. Climbing on top of it requires a move action from an adjacent square or a DC24 acrobatics check.
Dotted black line is cage bars.
White rectangle is a door.
White rectangle with a dotted line is a secret door.